Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
  • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
  • C07D471/04—Ortho-condensed systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P17/00—Drugs for dermatological disorders
  • A61P17/16—Emollients or protectives, e.g. against radiation
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/04—Antibacterial agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system
  • A61P9/10—Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis

Definitions

• This invention relates to inhibition of protein tyrosine kinase (PTK) mediated cellular proliferation. More specifically, this invention relates to the use of pyrido[2,3-d]pyrimidines and naphthyridine compounds in inhibiting cellular proliferation and protein tyrosine kinase enzymatic activity.
• PTK protein tyrosine kinase
• the phosphorylation of tyrosine residues on protein substrates serves a critical function in intracellular growth signaling pathways initiated by stimulated extracellular growth factor receptors.
• growth factors such as Platelet Derived Growth Factor (PDGF), Fibroblast Growth Factor (FGF), and Epidermal Growth Factor (EGF)
• PDGF Platelet Derived Growth Factor
• FGF Fibroblast Growth Factor
• EGF Epidermal Growth Factor
• the phosphorylation of growth factor receptors in response to ligand binding is known as autophosphorylation.
• the EGF receptor has as its two most important ligands EGF and Transforming Growth Factor a, (TGFa).
• the receptors appear to have only minor functions in normal adult humans, but are implicated in the disease processes of a large portion of all cancers, especially colon and breast cancer.
• the closely related Erb-B2 and Erb-B3 receptors have a family of Heregulins as their major ligands, and receptor overexpression and mutation have been unequivocally demonstrated as the major risk factor in poor prognosis breast cancer.
• vascular smooth muscle cells The proliferation and directed migration of vascular smooth muscle cells (VSMC) are important components in such processes as vascular remodeling, restenosis and atherosclerosis.
• Platelet-derived growth factor has been identified as one of the most potent endogenous VSMC mitogens and chemoattractants. Elevated vascular mRNA expression of PDGF-A and -B chains and PDGF receptors has been observed in balloon-injured rat carotid arteries ( J. Cell. Biol., 111 :2149-2158 (1990)). In this injury model, infusion of PDGF also greatly increases intimal thickening and migration of VSMC ( J. Clin. Invest. , 89 :507-511 (1992)). Furthermore, PDGF-neutralizing antibodies significantly reduce intimal thickening following balloon injury ( Science , 253 :1129-1132 (1991)).
• aFGF acidic fibroblast growth factor
• bFGF basic fibroblast growth factor
• EGF, PDGF, FGF, and other growth factors play pivotal roles in the pathomechanisms of cellular proliferative diseases such as cancer, atherosclerosis, and restenosis.
• these growth factors Upon association with their respective receptors, these growth factors stimulate tyrosine kinase activity as one of the initial biochemical events leading to DNA synthesis and cell division. It thereby follows that compounds which inhibit protein tyrosine kinases associated with intracellular growth factor signal transduction pathways are useful agents for the treatment of cellular proliferative diseases.
• certain pyrido[2,3-d]-pyrimidines and naphthyridines inhibit protein tyrosine kinases, and are useful in treating and preventing atherosclerosis, restenosis, and cancer.
• U.S. Patent Number 3,534,039 discloses a series of 2,7-diamino-6-arylpyrido[2,3-d]pyrimidine compounds as diuretic agents
• U.S. Patent Number 3,639,401 discloses a series of 6-aryl-2,7-bis[(trialkylsilyl)amino]pyrido[2,3-d]-pyrimidine compounds as diuretic agents
• U.S. Patent Number 3,534,039 discloses a series of 2,7-diamino-6-arylpyrido[2,3-d]pyrimidine compounds as diuretic agents
• U.S. Patent Number 3,639,401 discloses a series of 6-aryl-2,7-bis[(trialkylsilyl)amino]pyrido[2,3-d]-pyrimidine compounds as diuretic agents
• Patent Number 4,271,164 discloses a series of 6-substituted-arylpyrido[2,3-d]pyrimidin-7-amines and derivatives as antihypertensive agents; European Published Application Number 0 537 463 A2 discloses a series of substituted-pyrido[2,3-d]pyrimidines useful as herbicides; U.S. Patent Number 4,771,054 discloses certain naphthyridines as antibiotics. None of the foregoing references teach the compounds of this invention or suggest such compounds are useful for treating atherosclerosis, restenosis, and cancer.
• This invention provides new compounds characterized as pyrido[2,3-d]pyrimidines and 1,6-naphthyridines which are useful in inhibiting protein tyrosine kinase, and thus are effective in treating cellular proliferative diseases of atherosclerosis, restenosis, and cancer.
• the invention is more particularly directed to compounds defined by the Formula I wherein
• Preferred compounds have Formula I wherein Ar is phenyl or substituted phenyl of the formula
• R 1 and R 3 are and R 2 and R 4 are hydrogen.
• Still further preferred compounds have Formula I wherein B is NR 3 R 4 , R 1 and R 3 independently are hydrogen, where R 8 is C 1 -C 8 alkyl or NR 5 R 6 .
• a particularly preferred group of compounds have the formula wherein R 2 and R 4 are hydrogen, R 1 and R 3 independently are hydrogen, C 1 -C 8 alkyl, where R 8 is C 1 -C 8 alkyl or -NR 5 R 6 , R 5 is hydrogen and R 6 is C 1 -C 8 alkyl, and R 9 and R 10 independently are hydrogen, halo, C 1 -C 8 alkyl, or C 1 -C 8 alkoxy.
• R 1 , R 2 , R 9 , and R 10 are as defined above.
• R 5 and R 6 together with the nitrogen to which they are attached from a cyclic ring
• morpholino piperazino
• 4-alkylpiperazino and the like.
• R 2 and R 4 are hydrogen, R 1 and R 3 independently are hydrogen, C 1 -C 6 alkyl, where R 8 , R 9 , and R 10 are as defined above.
• R 5 and R 6 together with the nitrogen to which they are attached form a cyclic ring
• morpholino, piperazino, 4-alkylpiperazino, and the like are also preferred.
• the most preferred compounds of the invention include the following:
• Yet another preferred group of compounds are amidines of the formula especially where R 8 is -NR 5 R 6 .
• Another preferred group of compounds have Formula I wherein Ar is other than phenyl or substituted phenyl. Typical of such compounds are pyridines of the formula
• This invention also provides pharmaceutical formulations comprising a compound of Formula I together with a pharmaceutically acceptable carrier, diluent, or excipient therefor.
• Compounds within the scope of the present invention have a specific affinity towards one or more of the substrate site of the tyrosine kinase domains of EGF, FGF, PDGF, V-src and C-src. Compounds within the scope of the present invention have effectively inhibited EGF and PDGF autophosphorylation of the receptor and inhibited vascular smooth muscle cell proliferation and migration.
• the compounds of the instant invention are useful in controlling proliferative disorders including leukemia, cancer, psoriasis, vascular smooth muscle proliferation associated with atherosclerosis, and postsurgical vascular stenosis and restenosis in mammals.
• a further embodiment of this invention is a method of treating subjects suffering from diseases caused by vascular smooth muscle proliferation.
• the method entails inhibiting vascular smooth muscle proliferation and/or migration by administering an effective amount of a compound of Formula I to a subject in need of treatment.
• the present invention is directed to methods for the preparation of a compound of Formula I and synthetic intermediates.
• the compounds of the present invention can exist in unsolvated forms as well as solvated forms, including hydrated forms.
• the solvated forms, including hydrated forms are equivalent to unsolvated forms and are intended to be encompassed within the scope of the present invention.
• C 1 -C 8 alkyl means a straight or branched hydrocarbon radical having from 1 to 8 carbon atoms and includes, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, 2,2-dimethylpropyl, n-hexyl, n-heptyl, n-octyl, and the like.
• Halo includes fluoro, chloro, bromo, and iodo.
• C 2 -C 8 Alkenyl means straight and branched hydrocarbon radicals having from 2 to 8 carbon atoms and 1 double bond and includes ethenyl, 3-buten-1-yl, 2-ethenylbutyl, 3-octen-1-yl, and the like.
• Typical C 2 -C 8 alkynyl groups include propynyl, 2-butyn-1-yl, 3-pentyn-1-yl, and the like.
• C 2 -C 6 Alkenyl are preferred.
• Cycloalkyl means a cyclic or bicyclic hydrocarbyl group such as cyclopropyl, cyclobutyl, cyclohexyl, cyclopentyl, adamantyl, bicyclo[3.2.1]octyl, bicyclo[2.2.1]heptyl, and the like, as well heterocyclics such as piperazinyl, tetrahydropyranyl, pyrrolidinyl, and the like.
• C 1 -C 8 Alkoxy refers to the alkyl groups mentioned above binding through oxygen, examples of which include methoxy, ethoxy, isopropoxy, tert -butoxy, n-octyloxy, and the like. C 1 -C 6 Alkoxy groups are preferred.
• C 1 -C 8 alkanoyl groups include formyl, acetyl, propionyl, butyryl, and isobutyryl.
• C 1 -C 8 alkanoyloxy includes acetoxy, tert -butanoyloxy, pentanoyloxy, and the like.
• alkyl, alkenyl, and alkynyl groups may be substituted with NR 5 R 6 and 5- or 6-membered carbocyclic and heterocyclic groups, containing 1 or 2 heteroatoms selected from nitrogen, oxygen, and sulfur. Such rings may be substituted, for example with one or two C 1 -C 6 alkyl groups.
• Examples include dimethylaminomethyl, 4-diethylamino-3-buten-1-yl, 5-ethylmethylamino-3-pentyn-1-yl-4-morpholinobutyl, 4-(4-methylpiperazin-1-yl)butyl, 4-tetrahydropyridinylbutyl-, 2-methyltetrahydropyridinomethyl-, 3-imidazolidin-1-ylpropyl, 4-tetrahydrothiazol-3-yl-butyl, phenylmethyl, 3-chlorophenylmethyl, and the like.
• Ar and Ar' refer to unsubstituted and substituted aromatic and heteroaromatic groups such as phenyl, 3-chlorophenyl, 2,6-dibromophenyl, pyridyl, 3-methylpyridyl, benzothienyl, 2,4,6-tribromophenyl, 4-ethylbenzothienyl, furanyl, 3,4-diethylfuranyl, naphthyl, 4,7-dichloronaphthyl, and the like.
• Preferred Ar and Ar' groups are phenyl and phenyl substituted by 1, 2, or 3 groups independently selected from halo, alkyl, alkoxy, thio, thioalkyl, hydroxy, alkanoyl, -CN, -NO 2 , -COOR 8 , -CF 3 alkanoyloxy, or amino of the formula -NR 5 R 6 .
• Disubstituted phenyl is preferred, and 2,6-disubstituted phenyl is especially preferred.
• Other preferred Ar and Ar' groups include pyridyl, e.g., 2-pyridyl and 4-pyridyl.
• Typical Ar and Ar' substituted phenyl groups thus include 2-aminophenyl, 3-chloro-4-methoxyphenyl, 2,6-diethylphenyl, 2-n-hexyl-3-fluorophenyl, 3-hydroxyphenyl, 3,4-dimethoxyphenyl, 2,6-dichlorophenyl, 2-chloro-6-methylphenyl, 2,4,6-trichlorophenyl, 2,6-dimethoxyphenyl, 2,6-dihydroxyphenyl, 2,6-dibromophenyl, 2,6-dinitrophenyl, 2,6-di-(trifluoromethyl)phenyl, 2,6-dimethylphenyl, 2,3,6-trimethylphenyl, 2,6-dibromo-4-methylphenyl, and the like.
• the compounds of Formula I are capable of further forming both pharmaceutically acceptable acid addition and/or base salts. All of these forms are within the scope of the present invention.
• Pharmaceutically acceptable acid addition salts of the compounds of Formula I include salts derived from inorganic acids such as hydrochloric, nitric, phosphoric, sulfuric, hydrobromic, hydriodic, phosphorous, and the like, as well as the salts derived from organic acids, such as aliphatic mono- and dicarboxylic acids, phenyl-substituted alkanoic acids, hydroxy alkanoic acids, alkanedioic acids, aromatic acids, aliphatic and aromatic sulfonic acids, etc.
• inorganic acids such as hydrochloric, nitric, phosphoric, sulfuric, hydrobromic, hydriodic, phosphorous, and the like
• organic acids such as aliphatic mono- and dicarboxylic acids, phenyl-substituted alkanoic acids, hydroxy alkanoic acids, alkanedioic acids, aromatic acids, aliphatic and aromatic sulfonic acids, etc.
• Such salts thus include sulfate, pyrosulfate, bisulfate, sulfite, bisulfite, nitrate, phosphate, monohydrogenphosphate, dihydrogenphosphate, metaphosphate, pyrophosphate, chloride, bromide, iodide, acetate, propionate, caprylate, isobutyrate, oxalate, malonate, succinate, suberate, sebacate, fumarate, maleate, mandelate, benzoate, chlorobenzoate, methylbenzoate, dinitrobenzoate, phthalate, benzenesulfonate, toluenesulfonate, phenylacetate, citrate, lactate, maleate, tartrate, methanesulfonate, and the like.
• salts of amino acids such as arginate and the like and gluconate, galacturonate (see, for example, Berge S.M., et al., "Pharmaceutical Salts,” J. of Pharmaceutical Science , 66 :1-19 (1977)).
• the acid addition salts of said basic compounds are prepared by contacting the free base form with a sufficient amount of the desired acid to produce the salt in the conventional manner.
• the free base form may be regenerated by contacting the salt form with a base and isolating the free base in the conventional manner.
• the free base forms differ from their respective salt forms somewhat in certain physical properties such as solubility in polar solvents, but otherwise the salts are equivalent to their respective free base for purposes of the present invention.
• Pharmaceutically acceptable base addition salts are formed with metals or amines, such as alkali and alkaline earth metals or organic amines.
• metals used as cations are sodium, potassium, magnesium, calcium, and the like.
• suitable amines are N,N'-dibenzylethylenediamine, chloro-procaine, choline, diethanolamine, ethylenediamine, N-methylglucamine, and procaine (see, for example, Berge S.M., et al., "Pharmaceutical Salts," J. of Pharmaceutical Science , 66 :1-19 (1977)).
• the base addition salts of said acidic compounds are prepared by contacting the free acid form with a sufficient amount of the desired base to produce the salt in the conventional manner.
• the free acid form may be regenerated by contacting the salt form with an acid and isolating the free acid in the conventional manner.
• the free acid forms differ from their respective salt forms somewhat in certain physical properties such as solubility in polar solvents, but otherwise the salts are equivalent to their respective free acid for purposes of the present invention.
• Scheme I describes a typical method for the preparation of 1-tert-butyl-3-[7-(3-tert-butylureido)-6-(aryl)-pyrido[2,3-d]pyrimidin-2-yl]ureas and 1-[2-Amino-6-(aryl)-pyrido[2,3-d]pyrimidin-7-yl]-3-tert-butylureas from the key intermediate 2,7-diamino-6-(aryl)-pyrido[2,3-d]pyrimidine, which can be prepared by the method of U.S. Patent Number 3,534,039.
• the reaction can be accomplished by reacting 2,7-diamino-6-(aryl)-pyrido[2,3-d]pyrimidine compounds with one equivalent of an acylating agent, such as an alkyl isocyanate, isothiocyanate, carbamoyl chloride, carbamoyl bromide, sulfamoyl chloride, chloroformate, or other activated acid derivatives such as symmetrical anhydrides, mixed anhydride, and the like.
• an acylating agent such as an alkyl isocyanate, isothiocyanate, carbamoyl chloride, carbamoyl bromide, sulfamoyl chloride, chloroformate, or other activated acid derivatives such as symmetrical anhydrides, mixed anhydride, and the like.
• the reaction is carried out in neat isocyanate, or in the presence of a base, preferably sodium hydride in a suitable unreactive solvent such as dimethylformamide, dio
• the starting material a 2,7-diamino-6-(aryl)-pyrido[2,3-d]pyrimidine
• acylating reagent to give primarily the diacylated compounds, for example a 1-tert-butyl-3-[7-(3-tert-butylureido)-6-(aryl)-pyrido-[2,3-d]pyrimidin-2-yl]urea.
• the acylation generally is substantially complete when conducted for about 1 to 3 hours at a temperature of about 20° to about 80°C.
• the product is readily isolated by normal methods, for instance by filtering any solids and removing the reaction solvent by evaporation.
• the product can be purified if desired by routine methods, for instance crystallization from organic solvents such as ethyl acetate, dicholoro-methane, hexane, and the like, as well as chromatography over solid supports such as silica gel.
• the compounds of the invention typically are solids which are readily crystallized.
• Scheme II illustrates a typical acylation of a 2,7-diamino-6-(aryl)-pyrido[2,3-d]pyrimidine using a two-fold or larger excess of acetic anhydride with heating to prepare the diacylated product, for example an N-[2-acetylamino-6-(aryl)-pyrido[2,3-d]pyrimidin-7-yl]-acetamide.
• diacylated compounds of this type can be prepared by this method starting from the appropriate 2,7-diamino-6-(aryl)-pyrido-[2,3-d]pyrimidine compounds and treating them with excess acylating reagents such as acid anhydrides, mixed acid anhydrides, or activated acyl derivatives such as acid chlorides and sulfonyl chlorides.
• the reaction is generally carried out at a temperature between about 20°C and 200°C.
• organic or inorganic bases such as triethylamine and sodium hydroxide may be desired to scavenger acid byproducts produced during the course of the reaction.
• the diacylated product is readily isolated and purified by chromatography or crystallization as described above.
• Scheme III illustrates the preparation of a 6-(aryl)-N 7 -alkyl-pyrido[2,3-d]pyrimidine-2, 7-diamine in several steps starting with a 2,7-diamino-6-(aryl)-pyrido[2,3-d]pyrimidine which can be prepared by the method of U.S. Patent Number 3,534,039.
• Treatment of the starting material with aqueous mineral acid under reflux conditions provides the hydrolysis product 2-amino-6-(aryl)-pyrido[2,3-d]pyrimidin-7-ol.
• the formamidine functionality can be removed by alcoholysis to provide the 7-chloro derivative, i.e., a 2-amino-7-chloro-6-(aryl)-pyrido[2,3-d]pyrimidine.
• Reaction of the 7-chloro intermediate with nucleophilic reagents such as an alkylamine provides the corresponding 6-(aryl)-N 7 -alkyl-pyrido[2,3-d]pyrimidine-2,7-diamine.
• Scheme IV describes the preparation of a 3-(aryl)-[1,6]naphthyridine-2,7-diamine and represents a general methodology for the preparation of these compounds.
• the hydrogenolysis of 6-bromo-2,4-diamino-5-cyanopyridine affords the intermediate 2,4-diamino-5-cyanopyridine.
• the subsequent hydrogenation of the cyanopyridine compound for example, in a mixture of formic acid-water employing Raney nickel catalyst, provides a key versatile intermediate 2,4-diamino-5-pyridine-carboxaldehyde.
• the aldehyde is then condensed with an aryl acetonitrile as described in Scheme IV to provide a 3-(aryl)-[1,6]naphthyridine-2,7-diamine.
• the condensation reaction is accomplished in the presence of an alkoxide base, for example, sodium ethoxide or sodium 2-ethoxyethoxide, which can be generated in situ by the addition of sodium metal or sodium hydride to ethanol or 2-ethoxyethanol.
• Scheme IV describes a general methodology for the preparation of the 3-(aryl)-[1,6]naphthyridine-2,7-diamines of this invention.
• Scheme V illustrates the direct dialkylation of a 6-aryl-pyrido[2,3-d]pyrimidine-2,7-diamine (U.S. Patent Number 3,534,039) with an alkylamine in a bomb at high temperature to afford an N 2 ,N 7 -dialkyl-6-aryl-pyrido[2,3-d]pyrimidine-2,7-diamine.
• this reaction is carried out using neat amine reagents such as isobutylamine and n-hexylamine, at a temperature such as 150-300°C in a bomb apparatus.
• Scheme VI illustrates the synthesis of compounds of Formula I wherein R 1 can be an aminoalkyl group such as diethylaminopropyl.
• R 1 can be an aminoalkyl group such as diethylaminopropyl.
• a 6-(aryl)-2,7-diamino-pyrido[2,3-d]pyrimidine can be reacted directly with an amine nucleophile such as an aminoalkylamine (e.g., H 2 N alkyl-NR 5 R 6 ), generally in a bomb and in the presence of an acid such as sulfamic acid, to afford an aminoalkyl substituted compound of the invention.
• the compound can be further acylated, if desired, by routine methods.
• the compounds are readily isolated and purified by common methodologies such as crystallization and chromatography.
• Scheme VII illustrates the synthesis of compounds of Formula I wherein R 3 and R 4 are taken together with the nitrogen to which they are attached to form a cyclic ring.
• the ring can include another heteroatom such as nitrogen, oxygen, or sulfur.
• a diaminopyridopyrimidine is reacted with a halo ethyl isocyanate to produce an imidazolidinone.
• the reaction generally is carried out in an organic solvent such as dimethylformamide, and normally in the presence of a base such as sodium hydride.
• the reaction typically is complete in about 8 to 16 hours when carried out at about 30°C.
• the product is readily isolated and purified by routine methods.
• Scheme VIIa illustrates the reaction.
• the product can be isolated by routine methods such as chromatography, fractional crystallization, and the like.
• amidines compounds of Formula I wherein R 1 and R 2 together with the nitrogen to which they are attached, and R 3 and R 4 together with the nitrogen to which they are attached, can be a group having the formula
• Scheme VIII illustrates the synthesis of typical pyridopyrimidine amidines which can be produced by reacting an amino pyridopyrimidine with an acetal of an amide or cyclic amide, for example, the dimethyl acetal of N,N-dimethylformamide, or the dimethylacetal of N-methylpyrrolidone.
• the reaction typically is carried out by mixing an amino pyridopyrimidine with about an equimolar quantity or excess of an acetal in a mutual solvent such as dimethylformamide, dimethylsulfoxide, tetrahydrofuran, or the like.
• the reaction generally is complete with about 3 to 6 hours when carried out at a temperature of about 5°C to about 50°C.
• the product is readily isolated by routine procedures and can be purified, if desired, by normal techniques such as chromatography, crystallization, and the like.
• the invention also provides amino pyridopyrimidines wherein the amino group is substituted with an aryl Ar', for example a phenyl, substituted phenyl, pyridyl, thiazolyl, pyrimidyl, and the like.
• aryl Ar' for example a phenyl, substituted phenyl, pyridyl, thiazolyl, pyrimidyl, and the like.
• Preferred N-aryl compounds have the formula where Ar, Ar', and B are as defined above.
• Such compounds can be prepared by any of several methods, for example, as described in Schemes IX and X.
• a pyridopyrimidine substituted with an alkylthio, alkyl sulfoxide or alkyl sulfone, for example at the 2-position is reacted with an aryl amine (e.g., Ar'NH 2 ), to effect displacement of the thio- sulfoxide or sulfone substituent, to produce the corresponding N-aryl amino pyridopyrimidine.
• the displacement reaction generally is carried out in an organic solvent such as dimethylformamide, normally at a temperature of about 20°C to about 80°C.
• the reaction generally is complete after about 3 to about 8 hours, and the product is readily isolated by adding the reaction mixture to water and extracting the product into a solvent such as methylene chloride, or the like.
• Scheme X illustrates the synthesis of N-aryl amino pyridopyrimidines starting from a suitably substituted pyrimidine, e.g., 4-amino-2-chloropyrimidine-5-carbonitrile.
• the halo group is displaced by reaction with an aryl amine (Ar'NH 2 ) to give the corresponding 2-N-aryl aminopyrimidine, having a cyano group at the 5-position.
• the cyano group is converted to an aldehyde by reduction with Raney nickel in water and formic acid, and the resulting 2-arylamino-4-amino-pyrimidine-5-carboxaldehyde is reacted with an aryl acetonitrile (e.g., phenylacetonitrile, 2-pyridyl-acetonitrile, or the like) in the manner described in Scheme IV to provide the corresponding N-aryl-amino-pyridopyrimidine of the invention.
• an aryl acetonitrile e.g., phenylacetonitrile, 2-pyridyl-acetonitrile, or the like
• the compounds of Formula I are valuable inhibitors of protein tyrosine kinases and possess therapeutic value as cellular antiproliferative agents for the treatment of proliferative disorders. These compounds are potent inhibitors of one or more of the protein kinases, PDGF, FGF, EGF, V-src, and C-src.
• the invention compounds are thus useful in treating atherosclerosis, restenosis, and cancer. Specific tumors to be treated with the compounds include small-cell lung carcinoma such as that described in An. Rev. Respir. Dis.
• the compounds also are useful as antibiotics against bacteria such as Streptococcus pneumoniae. For instance, the compounds of Examples 9 and 18 exhibited activity against this Gram + bacterial strain when evaluated in standard in vitro assays.
• the compounds additionally are useful as herbicides against a wide variety of undesirable plants such as broad leaf weeds and grasses.
• the compounds of the present invention can be formulated and administered in a wide variety of oral and parenteral dosage forms, including transdermal and rectal administration. It will be recognized to those skilled in the art that the following dosage forms may comprise as the active component, either a compound of Formula I or a corresponding pharmaceutically acceptable salt or solvate of a compound of Formula I.
• a further embodiment of this invention is a pharmaceutical formulation comprising a compound of Formula I together with a pharmaceutically acceptable carrier, diluent, or excipient therefor.
• pharmaceutically acceptable carriers can be either solid or liquid. Solid form preparations include powders, tablets, pills, capsules, cachets, suppositories, and dispersible granules.
• a solid carrier can be one or more substances which may also act as diluents, flavoring agents, binders, preservatives, tablet disintegrating agents, or an encapsulating material.
• the carrier is a finely divided solid such as talc or starch which is in a mixture with the finely divided active component.
• the active component is mixed with the carrier having the necessary binding properties in suitable proportions and compacted in the shape and size desired.
• the formulations of this invention preferably contain from about 5% to about 70% of the active compound.
• Suitable carriers include magnesium carbonate, magnesium stearate, talc, sugar, lactose, pectin, dextrin, starch, gelatin, tragacanth, methylcellulose, sodium carboxymethylcellulose, a low melting wax, cocoa butter, and the like.
• a preferred form for oral use are capsules, which include the formulation of the active compound with encapsulating material as a carrier providing a capsule in which the active component with or without other carriers, is surrounded by a carrier, which is thus in association with it.
• cachets and lozenges are included. Tablets, powders, capsules, pills, cachets, and lozenges can be used as solid dosage forms suitable for oral administration.
• a low melting wax such as a mixture of fatty acid glycerides or cocoa butter
• the active component is dispersed homogeneously therein, as by stirring.
• the molten homogenous mixture is then poured into convenient sized molds, allowed to cool, and thereby to solidify.
• Liquid form preparations include solutions, suspensions, and emulsions, for example, water or water-propylene glycol solutions.
• liquid preparations can be formulated in solution in aqueous polyethylene glycol solution, isotonic saline, 5% aqueous glucose, and the like.
• Aqueous solutions suitable for oral use can be prepared by dissolving the active component in water and adding suitable colorants, flavors, stabilizing and thickening agents as desired.
• Aqueous suspensions suitable for oral use can be made by dispersing the finely divided active component in water with a viscous material, such as natural or synthetic gums, resins, methylcellulose, sodium carboxymethylcellulose, and other well-known suspending agents.
• a viscous material such as natural or synthetic gums, resins, methylcellulose, sodium carboxymethylcellulose, and other well-known suspending agents.
• solid form preparations which are intended to be converted, shortly before use, to liquid form preparations for oral administration.
• liquid forms include solutions, suspensions, and emulsions.
• These preparations may contain, in addition to the active component, colorants, flavors, stabilizers, buffers, artificial and natural sweeteners, dispersants, thickeners, solubilizing agents, and the like.
• Waxes, polymers, and the like can be utilized to prepare sustained-release dosage forms.
• osmotic pumps can be employed to deliver the active compound uniformally over a prolonged period.
• the pharmaceutical preparations of the invention are preferably in unit dosage form.
• the preparation is subdivided into unit doses containing appropriate quantities of the active component.
• the unit dosage form can be a packaged preparation, the package containing discrete quantities of preparation, such as packeted tablets, capsules, and powders in vials or ampoules.
• the unit dosage form can be a capsules, tablet, cachet, or lozenge itself, or it can be the appropriate number of any of these in packaged form.
• the therapeutically effective dose of a compound of Formula I will generally be from about 1 mg to about 100 mg/kg of body weight per day. Typical adult doses will be about 50 to about 800 mg per day.
• the quantity of active component in a unit dose preparation may be varied or adjusted from about 0.1 mg to about 500 mg, preferably about 0.5 mg to 100 mg according to the particular application and the potency of the active component.
• the composition can, if desired, also contain other compatible therapeutic agents.
• a subject in need of treatment with a compound of Formula I will be administered a dosage of about 1 to about 500 mg per day, either singly or in multiple doses over a 24-hour period.
• the compounds of this invention have been evaluated in standard assays which are utilized to determine inhibition of tyrosine kinase.
• One such assay was conducted as follows:
• Human EGF receptor tyrosine kinase was isolated from A431 epidermoid carcinoma cells by the following methods. Cells were grown in roller bottles in 50% Delbuco's Modified Eagle and 50% HAM F-12 nutrient media (Gibco) containing 10% fetal calf serum.
• Enzyme assays for IC 50 determinations were performed in a total volume of 0.1 mL, containing 25 mM Hepes, pH 7.4, 5 mM MgCl 2 , 2 mM MnCl 2 , 50 ⁇ M sodium vanadate, 5-10 ng of EGF receptor tyrosine kinase, 200 ⁇ M of a substrate peptide, e.g., (Ac-Lys-His-Lys-Lys-Leu-Ala-Glu-Gly-Ser-Ala-Tyr 472 -Glu-Glu-Val-NH 2 ), (Wahl M.I., et al., J. Biol. Chem.
• Full length cDNAs for the mouse PDGF- ⁇ and human FGF-1 (flg) receptor tyrosine kinases were obtained from J. Escobedo and prepared as described in J. Biol. Chem. , 262 :1482-1487 (1991), and PCR primers were designed to amplify a fragment of DNA that codes for the intracellular tyrosine kinase domain. The fragment was melded into a baculovirus vector, cotransfected with AcMNPV DNA, and the recombinant virus isolated. SF9 insect cells were infected with the virus to overexpress the protein, and the cell lysate was used for the assay.
• the assay was performed in 96-well plates (100 ⁇ L/incubation/well), and conditions were optimized to measure the incorporation of 32 P from ⁇ 32 P-ATP into a glutamate-tyrosine co-polymer substrate. Briefly, to each well was added 82.5 ⁇ L of incubation buffer containing 25 mM Hepes (pH 7.0), 150 mM NaCl, 0.1% Triton X-100, 0.2 mM PMSF, 0.2 mM Na 3 VO 4, 10 mM MnCl 2 , and 750 ⁇ g/mL of Poly (4:1) glutamate-tyrosine followed by 2.5 ⁇ L of inhibitor and 5 ⁇ L of enzyme lysate (7.5 ⁇ g/ ⁇ L FGF-TK or 6.0 ⁇ g/ ⁇ L PDGF-TK) to initiate the reaction.
• incubation buffer containing 25 mM Hepes (pH 7.0), 150 mM NaCl, 0.1% Triton X-100, 0.2
• V-src or C-src kinase is purified from baculovirus infected insect cell lysates using an antipeptide monoclonal antibody directed against the N-terminal 2-17 amino acids.
• the antibody covalently linked to 0.65- ⁇ m latex beads, is added to a suspension of insect cell lysis buffer comprised of 150 mM NaCl, 50 mM Tris pH 7.5, 1 mM DTT, 1% NP-40, 2 mM EGTA, 1 mM sodium vanadate, 1 mM PMSF, 1 ⁇ g/mL each of leupeptin, pepstatin, and aprotinin.
• Insect cell lysate containing either the c-src or v-src protein is incubated with these beads for 3-4 hours at 4°C with rotation.
• the beads are rinsed 3 times in lysis buffer, resuspended in lysis buffer containing 10% glycerol, and frozen.
• These latex beads are thawed, rinsed three times in assay buffer which is comprised of 40 mM tris pH 7.5, 5 mM MgCl 2 , and suspended in the same buffer.
• reaction components 10- ⁇ L v-src or c-src beads, 10 ⁇ L of 2.5 mg/mL poly GluTyr substrate, 5 ⁇ M ATP containing 0.2 ⁇ Ci labeled 32 P-ATP, 5 ⁇ L DMSO containing inhibitors or as a solvent control, and buffer to make the final volume 125 ⁇ L.
• the reaction is started at room temperature by addition of the ATP and quenched 10 minutes later by the addition of 125 ⁇ L of 30% TCA, 0.1 M sodium pyrophosphate for 5 minutes on ice.
• the plate is then filtered and the wells washed with two 250- ⁇ L aliquots of 15% TCA, 0.1 M pyrophosphate.
• the filters are punched, counted in a liquid scintillation counter, and the data examined for inhibitory activity in comparison to a known inhibitor such as erbstatin. The method is described more fully in J. Med. Chem. , 37 :598-609 (1994).
• Rat aorta smooth muscle cells were isolated from the thoracic aorta of rats and explanted according to the method of Ross, J. Cell. Biol., 30 :172-186 (1971). Cells were grown in Dulbecco's modified Eagle's medium (DMEM, Gibco) containing 10% fetal calf serum (FBS, Hyclone, Logan, Utah), 1% glutamine (Gibco) and 1% penicillin/streptomycin (Gibco). Cells were identified as smooth muscle cells by their "hill and valley” growth pattern and by fluorescent staining with a monoclonal antibody specific for SMC ⁇ -actin (Sigma). RASMC were used between passages 5 and 20 for all experiments. Test compounds were prepared in dimethylsulfoxide (DMSO) in order to achieve consistency in the vehicle and to ensure compound solubility. Appropriate DMSO controls were simultaneously evaluated with the test compounds.
• DMEM Dulbecco's modified Eagle's medium
• FBS
• RASMC were plated into a 24-well plate (30,000 cells/well) in DMEM with 10% FBS. After 4 days, cells reached confluence and were made quiescent by incubation in DMEM/F12 medium (Gibco) containing 0.2% FBS for another 2 days. DNA synthesis was induced by incubating cells for 22 hours with either PDGF-BB, bFGF, or FBS, plus test compound in 0.5 mL/well serum-substituted medium (DMEM/F12 + 1% CPSR-2 from Sigma). After 18 hours, 0.25 ⁇ Ci/well [ 3 H]-thymidine was added.
• RASMC were grown to confluency in 100 mm dishes. Growth medium was removed and replaced with serum-free medium and cells were incubated at 37°C for an additional 24 hours. Test compounds were then added directly to the medium and cells incubated for an additional 2 hours. After 2 hours, PDGF-BB was added at a final concentration of 30 ng/mL for 5 minutes at 37°C to stimulated autophosphorylation of the PDGF receptor.
• lysis buffer 50 mM HEPES[pH 7.5], 150 mM NaCl, 10% glycerol, 1% Triton X-100, 1 mM EDTA, 1 mMEGTA, 50 mM NaF, 1 mM sodium orthovanadate, 30 mM p-nitrophenyl phosphate, 10 mM sodium pyrophosphate, 1 mM phenylmethyl sulfonyl fluoride, 10 ⁇ g/mL aprotinin, and 10 ⁇ g/mL leupeptin).
• lysis buffer 50 mM HEPES[pH 7.5], 150 mM NaCl, 10% glycerol, 1% Triton X-100, 1 mM EDTA, 1 mMEGTA, 50 mM NaF, 1 mM sodium orthovanadate, 30 mM p-nitrophenyl phosphate, 10 mM sodium pyrophosphate, 1 mM pheny
• Lysates were centrifuged at 10,000 ⁇ g for 10 minutes. Supernatants were incubated with 10 ⁇ L of rabbit anti-human PDGF type AB receptor antibody (1:1000) for 2 hours. Following the incubation, protein-A-sepharose beads were added for 2 hours with continuous mixing, and immune complexes bound to the beads washed 4 times with 1 mL lysis wash buffer. Immune complexes were solubilized in 30 ⁇ L of Laemmli sample buffer and electrophoresed in 4-20% SDS polyacrylamide gels. Following electrophoresis, separated proteins were transferred to nitrocellulose and immunoblotted with anti-phosphotyrosine antiserum.
• the invention compounds are especially useful for treating restenosis following balloon angioplasty of occluded arteries. Restenosis occurs in about 40% of individuals undergoing angioplasty of calcified arteries and is a major problem associated with this form of treatment of patients suffering from such cardiac condition.
• the invention compounds demonstrate good activity when evaluated in standard tests such as described below.
• Balloon injury in rat carotid arteries were performed according to the following protocol. Rats were anesthetized with Telazol (0.1 mL/100 g IM), and the carotid artery exposed via an anterior mid-line incision on the neck. The carotid artery was isolated at the bifurcation of the internal and external carotid arteries. A 2F embolectomy catheter was inserted in the external carotid artery and advanced down the common carotid to the level of the aortic arch. The balloon was inflated and the catheter is dragged back to the point of entry and then deflated. This procedure is repeated two more times. The embolectomy catheter was then removed and the external carotid artery was ligated leaving flow intact through the internal carotid artery. Surgical incisions were closed, and the animal was allowed to recover from anesthesia before being returned to its home cage.
• the product is purified by silica gel chromatography eluting with a gradient of 0-1% methanol in chloroform to afford, after crystallization from ethanol, 0.7 g of 1-tert-butyl-3-[7-(3-tert-butylureido)-6-(dichlorophenyl)-pyrido[2,3-d]pyrimidin-2-yl]urea, mp 200°C dec. Analysis calculated for C 23 H 22 Cl 2 N 7 O 2 ⁇ 0.1 H 2 O: Theory C, 54.57; H, 5.42; N, 19.37; H 2 O, 0.36. Found C, 54.05; H, 5.43; N, 19.08; H 2 O, 0.37.
• the reaction mixture was allowed to cool to room temperature, filtered, and the volatile components of the filtrate removed on a rotary evaporator in vacuo.
• the viscous oil was partitioned between diethyl ether and water, the layers were separated, and the ethereal layer was washed with water.
• the organic layer was dried over anhydrous magnesium sulfate, filtered, and evaporated.
• the residue was partitioned between diethyl ether and dilute 1N HCl.
• the aqueous layer was washed three times with diethylether and made alkaline to pH 12 by addition of sodium hydroxide.
• a mixture of 45 g of the disulfamate salt of 6-phenyl-pyrido[2,3-d]pyrimidine-2,7-diamine (U.S. Patent Number 3,534,039) and 500 g of methylamine were heated at 205-210°C in a bomb for 10 hours.
• the bomb was washed with methanol and combined with the reaction mixture.
• the mixture was heated to a boil, filtered, and diluted with 200 mL of water.
• the filtrate was removed in vacuo and the residue slurried in ice-water.
• the insoluble material was filtered and washed with cold water.
• the solid was dissolved in chloroform, filtered to remove impurities, and washed several times with water.
• Example 2 The title compound was prepared as described in Example 2 by reacting 1.0 g of 2,7-diamino-6-(2,6-dichlorophenyl)-pyrido[2,3-d]pyrimidine from Example 1 and 0.339 g of n-propyl isocyanate. The product was purified by radial chromatography eluting with a gradient of 10-100% ethyl acetate/Hexane. MS(CI). Analysis calculated for C 17 H 16 Cl 2 N 6 O 1 ⁇ 0.43 H 2 O: C, 51.17; H, 4.26; N, 21.06. Found C, 51.15; H, 3.90; N, 20.80.
• Example 20 The title compound was prepared as in Example 20 by reacting 3.0 g of 2,7-diamino-6-(2,6-dichlorophenyl)-pyrido[2,3-d]pyrimidine from Example 1 and 60 mL of 3-(dimethylamino)propylamine to give the title compound.
• Example 20 The title compound was prepared as described above in Example 20 by reacting 2.0 g of 2,7-diamino-6-(2,6-dichlorophenyl)-pyrido[2,3-d]pyrimidine from Example 1 and 15 mL of N,N,2,2-tetramethyl-1,3-propanediamine.
• Example 20 The title compound was prepared as described above in Example 20 starting from 2.0 g of 2,7-diamino-6-(2,6-dichlorophenyl)-pyrido[2,3-d]pyrimidine from Example 1 and 15 mL of 1-(3-aminopropyl)-2-picoline to give the title compound.
• Example 21 1.54 g of 7-amino-6-(2,6-dichlorophenyl)-2-(3-(2-picoline)-propylamino)-pyrido[2,3-d]pyrimidine from Example 31 was reacted with 0.377 g of t-butyl isocyanate to give the title compound.
• Analysis calculated for C 27 H 35 Cl 2 N 7 O 1 C, 59.56; H, 6.48; N, 18.01. Found C, 59.71; H, 6.53; N, 17.62.
• Example 21 1.07 g of 7-amino-6-(2,6-dichlorophenyl)-2-(4-(4-methylpiperazine)-butylamino)-pyrido[2,3-d]pyrimidine from above in Example 33 was reacted with 0.253 g of t-butyl isocyanate to give the title compound.
• Example 36 6-(2,6-Dichlorophenyl)-N 2 -[3-(4-methyl-piperazin-1-yl)-propyl]-pyrido[2,3-d]pyrimidine-2,7-diamine (1.0 g) from Example 36 was reacted with 0.186 g of allyl isocyanate according to the general procedure of Example 37.
• Example 36 6-(2,6-Dichlorophenyl)-N 2 -[3-(4-methyl-piperazin-1-yl)-propyl]-pyrido[2,3-d]pyrimidine-2,7-diamine (1.0 g) from Example 36 was reacted with 0.348 g of octyl isocyanate according to the general procedure of Example 21.
• Example 36 6-(2,6-Dichlorophenyl)-N 2 -[3-(4-methyl-piperazin-1-yl)-propyl]-pyrido[2,3-d]pyrimidine-2,7-diamine (1.0 g) from Example 36 was reacted with 0.378 g of 1-naphthyl isocyanate according to the general procedure of Example 37.
• Example 61 6-(2,6-Dibromo-phenyl)-N 2 -[3-diethylamino-propyl)-pyrido[2,3-d]pyrimidine-2,7-diamine (0.34 g) from Example 61 was reacted with 0.066 g of tert-butyl isocyanate according to the general procedure of Example 54.
• Example 71 4-Amino-2-phenylamino-pyrimidine-5-carbonitrile (2.00 g) obtained from Example 71 was combined with wet Raney nickel (2.00 g), 98% formic acid (60 mL) and water (40 mL) in a Parr shaker. The reaction was placed under hydrogen (42 psi) and shaken for 20 minutes. The reaction was filtered, and the filtrate was concentrated in vacuo. The residue was suspended in water, made basic with saturated sodium bicarbonate, and extracted with ethyl acetate three times. The aqueous layer was filtered through a fiberglass filter to disperse the emulsion that was present. The aqueous filtrate was washed with ethyl acetate.
• Example 3 1-[2-Amino-6-(2,6-dichlorophenyl)-pyrido[2,3-d]-pyrimidin-7-yl]-3-tert-butylurea from Example 3 was reacted with DMF dimethyl acetal for 13.5 hours as described in Example 78.
• Example 2 0.246 g of 6-phenyl-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 81 was reacted with 0.128 mL of tert-butyl isocyanate.
• the product is purified by medium pressure chromatography using silica gel and eluting with a gradient of 1:1 CHCl 3 :EtOAc to EtOAc to afford the title compound; mp >250°C, CIMS (1% ammonia in methane): m/z (relative intensity) 337 (MH + + 1, 64), 338 (MH + + 2, 11), 236 (100).
• Example 2 The procedure of Example 2 was followed to react 0.30 g of 6-(2,3,6-trichloro-phenyl)-pyrido[2,3-d]-pyrimidine-2,7-diamine from Example 85 with tert-butyl isocyanate (0.108 mL).
• the product is purified by medium pressure chromatography (MPLC) using silica gel and eluting with 1:1 CHCl 3 :EtOAc to afford the title compound; mp 329-330°C, CIMS (1% ammonia in methane): m/z (relative intensity) 439 (MH + - 1, 3), 441 (MH + + 1, 3), 84 (100).
• MPLC medium pressure chromatography
• the title compound was prepared from 0.25 g of 6-(2,6-difluoro-phenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 63 and 0.112 mL of tert-butyl isocyanate according to Example 2.
• the product was purified by MPLC eluting with a gradient of CHCl 3 :EtOAc (1:1) to EtOAc to afford the pure product; mp >300°C, CIMS (1% ammonia in methane): m/z (relative intensity) 373 (MH + + 1, 60), 374 (MH + + 2, 10), 274 (100).
• the title compound was prepared from 0.25 g of 6-(2,6-dibromo-phenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 60 and 0.077 mL of tert-butyl isocyanate according to Example 2.
• the product was purified by MPLC eluting with a gradient of CHCl 3 :EtOAc (1:1) to EtOAc to afford the pure product; mp >300°C (dec).
• the title compound was prepared from 0.5 g of 6-(2,6-dichlorophenyl)-pyrido(2,3-d]pyrimidine-2,7-diamine from Example 1 and 0.172 mL of isopropyl isocyanate according to Example 2.
• the product was purified by MPLC eluting with a gradient of CHCl 3 :EtOAc (1:1) to afford the pure product; mp 184-188°C, CIMS (1% ammonia in methane): m/z (relative intensity) 391 (MH + , 16), 393 (MH + + 2, 11), 306 (100).
• the title compound was prepared from 6-o-tolyl-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 90 and tert-butyl isocyanate according to Example 2.
• the product was purified by MPLC eluting with CHCl 3 :EtOAc (1:1) afford the pure product; mp 195-197°C, CIMS (1% ammonia in methane): m/z (relative intensity) 351 (MH + + 1, 55), 352 (MH + + 2, 12), 84 (100).
• the title compound was prepared according to Example 1, starting from 2,3-dimethylphenylacetonitrile and 2,4-diamino-5-pyrimidine-carboxaldehyde; mp 330-333°C.
• the title compound was prepared from 0.5007 g of 6-(2,3-dimethyl-phenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 92 and 0.23 mL tert-butyl isocyanate according to Example 2.
• the product was purified by MPLC eluting with a gradient of CHCl 3 :EtOAc (2:1) to CHCl 3 :EtOAc (1:1); mp 326-330°C, MS(CI). Analysis calculated for C 20 H 24 N 6 O 1 ⁇ 0.81 H 2 O: C, 63.38; H, 6.81; N, 22.17. Found C, 63.54; H, 6.47; N, 21.77.
• the title compound was prepared from 0.3 g of 6-(3,5-dimethyl-phenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 94 and 0.14 mL of tert-butyl isocyanate according to Example 2.
• the product is purified by MPLC eluting with 1:1 CHCl 3 :EtOAc; mp 180-182°C, CIMS (1% ammonia in methane): m/z (relative intensity) 365 (MH + + 1, 16), 366 (MH + + 2, 3), 84 (100).
• the title compound was prepared according to Example 1, starting from 0.915 g of 2,4,6-trimethylbenzyl cyanide and 0.76 g of 2,4-diamino-5-pyrimidine-carboxaldehyde; mp 276-282°C; CIMS (1% ammonia in methane): m/z (relative intensity) 279 (MH + , 54), 280 (MH + + 1, 100).
• the title compound was prepared from 0.25 g of 6-(2,4,6-trimethyl-phenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 96 and 0.109 mL of tert-butyl isocyanate according to Example 2.
• the product was purified by medium pressure liquid chromatography eluting with 1:1 CHCl 3 :EtOAc; mp 281-297°C; CIMS (1% ammonia in methane): m/z (relative intensity) 379 (MH + + 1, 100), 380 (MH + + 2, 23).
• the title compound was prepared according to Example 1, starting from 1.999 g of 2,3,5,6-trimethylbenzyl cyanide and 1.52 g of 2,4-diamino-5-pyrimidine-carboxaldehyde; mp 327-331°C; CIMS (1% ammonia in methane): m/z (relative intensity) 293 (MH + , 65), 294 (MH + + 1, 100).
• the title compound was prepared from 0.3 g of 6-(2,3,5,6-tetramethyl-phenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 98 and 0.125 mL of tert-butyl isocyanate according to Example 2.
• the product was purified by medium pressure liquid chromatography eluting with 1:1 CHCl 3 :EtOAc; mp >300°C; CIMS (1% ammonia in methane): m/z (relative intensity) 393 (MH + , 55), 394 (MH + + 1, 13), 84 (100).
• the title compound was prepared from 0.203 g of 6-(2-methoxy-phenyl)-pyrido[2, 3-d]pyrimidine-2,7-diamine from Example 100 and 0.093 mL of tert-butyl isocyanate according to Example 2.
• the product was purified by medium pressure liquid chromatography eluting with 1:1 CHCl 3 :EtOAc; mp 300-301°C; CIMS (1% ammonia in methane): m/z (relative intensity) 367 (MH + + 1, 67), 368 (MH + + 2, 14), 236 (100).
• the title compound was prepared from 0.50 g of 6-(3-methoxy-phenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 102 and 0.23 mL tert-butyl isocyanate according to Example 2.
• the product was purified by medium pressure liquid chromatography eluting with a gradient of CHCl 3 :EtOAc (2:1) to CHCl 3 :EtOAc (1:1) to EtOAc; mp 275-280°C; MS(CI). Analysis calculated for C 19 H 22 N 6 O 2 ⁇ 0.45 H 2 O: C, 60.93; H, 6.16; N, 22.44. Found C, 61.22; H, 5.89; N, 22.09.
• the title compound was prepared using 0.30 g of 6-(2-bromo-6-chloro-phenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 104 and 0.105 mL of tert-butyl isocyanate according to Example 2.
• the product was purified by MPLC eluting with 1:1 CHCl 3 :EtOAc; mp 314°C (dec); MS(CI). Analysis calculated for C 18 H 18 Br 1 Cl 1 N 6 O 1 ⁇ 0.43 CHCl 3 ⁇ 0.27 C 4 H 8 O 2 : C, 44.65; H, 3.95; N, 16.01; Br, 15.22; Cl, 15.47. Found C, 44.39; H, 3.96; N, 15.82; Br, 14.83; Cl, 15.39.
• the product is purified by medium pressure liquid chromatography (MPLC) using silica gel and eluting with a gradient of CHCl 3 :EtOAC (2:1) to CHCl 3 :EtOAc (1:1) to afford the title compound.
• MPLC medium pressure liquid chromatography
• Example 1 The procedure of Example 1 was followed to react 3-pyridylacetonitrile and 2,4-diamino-5-pyrimidine-carboxaldehyde to afford the title compound; mp 317-319°C (dec). Analysis calculated for C 12 H 10 N 6 : Theory C, 60.50; H, 4.23; N, 35.27. Found C, 60.5; H, 4.3; N, 35.6.
• Example 2 By following the procedure of Example 2, 0.30 g of 2,7-diamino-6-(3-pyridyl)-pyrido[2,3-d]pyrido[2,3-d]-pyrimidine from Example 107 was reacted with 0.16 mL of tert-butyl isocyanate. The product was purified by medium pressure chromatography using silica gel and eluting with 90:10:1 EtOAc:MeOH:TEA to afford the title compound; mp >300°C; CIMS (1% ammonia in methane): m/z (relative intensity) 338 (MH + + 1, 8), 339 (MH + + 2, 1), 84 (100).
• Example 2 Following the procedure of Example 2, 0.30 g of 2,7-diamino-6-(4-pyridyl)-pyrido[2,3-d]pyrimidine from Example 109 was reacted with 0.154 mL of tert-butyl isocyanate. The product was purified by medium pressure chromatography using silica gel and eluting with 90:10:1 EtOAc:MeOH:TEA, to afford the title compound, mp >350°C; CIMS (1% ammonia in methane): m/z (relative intensity) 338 (MH + + 1, 6), 339 (MH + + 2, 1), 84 (100).
• Example 1 The procedure of Example 1 was followed to react 0.84 mL of 2-pyridylacetonitrile and 1.0 g of 2,4-diamino-5-pyrimidinecarboxaldehyde to afford the title compound, mp 312-321°C. Analysis calculated for C 12 H 10 N 6 ⁇ 0.07 H 2 O: C, 60.18; H, 4.27; N, 35.09. Found C, 60.46; H, 4.34; N, 34.70.
• Example 21 By following the general procedure of Example 21, 0.85 g of 7-amino-6-(2,6-dichlorophenyl)-2-(3-diethylamino-propylamino)-pyrido[2,3-d]pyrimidine from Example 20 was reacted with 0.176 mL of ethyl isocyanate.
• the product was purified by reverse phase preparative HPLC on a C18 reverse phase column, eluting with a solvent gradient starting from 90% of 0.1% trifluoroacetic acid in water/10% of 0.1% trifluoroacetic acid in acetonitrile to 60% of 0.1% trifluoroacetic acid in water/40% of 0.1% trifluoroacetic acid in acetonitrile, mp 92-108°C.
• Example 21 The procedure of Example 21 was followed to react 0.30 g of 7-amino-6-(2,6-dichlorophenyl)-2-(3-diethylamino-propylamino)-pyrido[2,3-d]pyrimidine from Example 20 and 0.077 mL of isopropyl isocyanate.
• the product was purified by medium press door chromatography on silica gel eluting with 90:10:1 EtOAc:MeOH:TEA to afford the title compound, mp 88-100°C; CIMS (1% ammonia in methane): m/z (relative intensity) 504 (MH + , 3), 506 (MH + + 2, 2), 86 (100).
• Example 20 The procedure of Example 20 was followed to react 3.0 g of 2,7-Diamino-6-(2,6-dimethylphenyl)pyrido-[2,3-d]pyrimidine from Example 6 and 30 mL of 1-amino-3-(N,N-diethylamino)propane to give the title compound, mp 216-219°C. Analysis calculated for C 22 H 30 N 6 ⁇ 0.15 H 2 O: C, 69.31; H, 8.01; N, 22.04. Found C, 69.29; H, 7.89; N, 22.04.
• Example 21 Prepared as described in Example 21, starting from 7-amino-6-(2,6-dimethylphenyl)-2-(3-diethylamino-propylamino)-pyrido[2,3-d]pyrimidine from Example 114 and ethyl isocyanate.
• the product was purified by reverse phase preparative HPLC on a C18 reverse phase column, eluting with a solvent gradient starting from 100% of 0.1% trifluoroacetic acid in water/0% of 0.1% trifluoroacetic acid in acetonitrile to 70% of 0.1% trifluoroacetic acid in water/30% of 0.1% trifluoroacetic acid in acetonitrile, mp 64-70°C. Analysis calculated for C 25 H 35 N 7 O 1 ⁇ 0.35 H 2 O: C, 65.86; H, 7.89; N, 21.51. Found C, 65.78; H, 7.63; N, 21.39.
• Example 21 Prepared as described in Example 21, starting from 0.50 g of 7-amino-6-(2,6-dimethylphenyl)-2-(3-diethylamino-propylamino) -pyrido[2, 3-d]pyrimidine from Example 114 and 0.17 mL of tert-butyl isocyanate.
• the product was purified by reverse phase preparative HPLC on a C18 reverse phase column, eluting with a solvent gradient starting from 95% of 0.1% trifluoroacetic acid in water/5% of 0.1% trifluoroacetic acid in acetonitrile to 65% of 0.1% trifluoroacetic acid in water/35% of 0.1% trifluoroacetic acid in acetonitrile, mp 86-91°C.
• Analysis calculated for C 27 H 39 N 7 O 1 Theory C, 67.89; H, 8.23; N, 20.53. Found C, 67.70; H, 8.24; N, 20.43.
• Example 37 Prepared as described above in Example 37 starting from 0.5 g of N 2 -[3-(4-methyl-piperazin-l-yl)-propyl]-6-(2,6-dichlorophenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 36 and 0.218 g of 1-adamantyl isocyanate.
• Example 37 Prepared as described above in Example 37 starting from 0.5 g of N 2 -[3-(4-methyl-piperazin-1-yl)-propyl]-6-(2,6-dichlorophenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 36 and 0.142 g of tert-butyl isothiocyanate. The product was purified by medium pressure chromatography using silica gel and eluting with 90:10:1 EtOAc:MeOH:TEA which gave a mixture of two products.
• the mixture was further purified by reverse phase preparative HPLC on a C18 reverse phase column, eluting with a solvent gradient starting from 95% of 0.1% trifluoroacetic acid in water/5% of 0.1% trifluoroacetic acid in acetonitrile to 65% of 0.1% trifluoroacetic acid in water/35% of 0.1% trifluoroacetic acid in acetonitrile, mp >200°C (dec); MS (ES).
• Example 37 Prepared as described in Example 37 starting from 0.41 g of N 2 -[3-(4-methyl-piperazin-1-yl)-propyl]-6-(2,3,5,6-tetramethyl-phenyl)-pyrido[2,3-d]pyrimidine-2,7-diamine from Example 120 and 0.12 mL of tert-butyl isocyanate.
• the product was purified by medium pressure chromatography using silica gel and eluting with 90:10:1 EtOAc:MeOH:TEA to afford the title compound, mp 185-198°C.
• Analysis calculated for C 30 H 44 N 8 O 1 Theory C, 67.64; H, 8.33; N, 21.03. Found C, 67.31; H, 8.23; N, 20.87.
• Example 37 Prepared as described in Example 37 starting from 0.3926 g of N 2 -[3-(4-methyl-piperazin-1-yl)-propyl]-6-(2,6-dichlorophenyl)-pyrido [2,3-d]pyrimidine-2,7-diamine from Example 53 and 0.18 g of 3-morpholinopropyl isothiocyanate.
• a pharmaceutical formulation in the form of hard gelatin capsules for oral administration are prepared using the following ingredients: Quantity (mg/capsule) Active compound 250 Starch powder 200 Magnesium stearate 10 Total 460 mg
• a typical active ingredient is N-[2-formylamino-6-(3,5-dimethylphenyl)-pyrido[2,3-d]pyrimidin-7-yl]-n-butyamide.
• the composition is administered from 2 to 4 times a day for treatment of postsurgical restenosis.
• the sorbitol solution is added to 40 mL of distilled water and the naphthyridine is suspended therein.
• the saccharin, sodium benzoate, and flavoring are added and dissolved.
• the volume is adjusted to 100 mL with distilled water.
• Each milliliter of syrup contains 5 mg of active ingredient.
• the active ingredients, starch, and cellulose are passed through a No. 45 mesh U.S. sieve and mixed thoroughly.
• the solution of polyvinylpyrrolidone is mixed with the resultant powders and then passed through a No. 14 mesh U.S. sieve.
• the granules are dried at 50-60°C and passed through a No. 18 mesh U.S. sieve.
• the sodium carboxymethyl starch, magnesium stearate, and talc previously passed through a No. 60 mesh U.S. sieve, are then added to the granules which, after mixing, are compressed on a tablet machine to yield tablets each weighing 150 mg.
• a typical active ingredient utilized in the above preparation is the compound of Example 21.
• a parenteral composition suitable for administration by injection is prepared by dissolving 100 mg of 1-[2-amino-6-(2,6-dichlorophenyl)-pyrido-[2,3-d]pyrimidin-7-yl]-3-(3-morpholin-4-yl-propyl)-thiourea in 250 mL of 0.9% aqueous sodium chloride solution and adjusting the pH of the solution to about 7.0.
• This formulation is well suited for the treatment of breast cancer.
• a mixture of 500 mg of 1-[2-amino-6-(2,6-dichlorophenyl)-pyrido[2,3-d]pyrimidin-7-yl]-imidazolidin-2-one and 1500 mg of theobroma oil are blended to uniformity at 60°C.
• the mixture is cooled to 24°C in tapered molds.
• Each suppository will weigh about 2 g and can be administered from 1 to 2 times each day for treatment of bacterial infections.

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• 1995
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